Bending collapse analysis for thin and medium-thin-walled square and rectangular hollow shapes

Thin-walled hollow shapes are of great interest in many industries with weight constraints due to their availability, low price, and strength ratio. However, they also prone localized bending collapse, which can be used as an energy absorption mechanism during deformation. Up until now, industrial applications have relied on numerical simulations, non-standardized tests, a handful theories address the collapse behavior. In this paper, modification most widely theory is presented adapted for greater thickness that cannot considered “thick”. To verify accuracy proposed modification, comparison detailed FEM model, validated through various three-point experimental has been performed. The results seem show modifications predict maximum load stage behavior more than original analytical model. Thus, may commercially available square rectangular different fields application.